I don't think so. I only Oc'd 1 card to 790/1050 for 15 minutes.

The second card was never OC'd. On the initial bootup with both cards inserted and powered up and with the cF bridges installed XP would not load.

Hence, I removed 1 card thinking a Corsair 750TX was insufficiently powering the cards. However, after this neither card never worked again.

Though they can be seen through ATI Flacs when another ATI model card is used as the primary.